AOTAI MIG350MC Manual de usuario
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Dear Customer
This instruction manual will help you get to know your new machine. Read the manual
carefully and you will soon be familiar with all the many great features of your new
product. Meanwhile, please remember well safety rules and operate as instruction.
If you treat your product carefully, this definitely helps to prolong its enduring quality and
reliability things which are both essential prerequisites for getting outstanding results.
Production specification may change without advance notice.
The model you purchase is:
MIG350MC
Please find corresponding models from the "Contents".
Important:
Please take special note of safety rules and operate as instruction in case of damage
and serious injury.
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Safety Rules
“Danger”indicates an imminently hazardous situation which, if not avoided, will result in death or
serious injury.
“Warning!”indicates a possible hazardous situation which, if not avoided, could result in death or
serious injury. The possible hazards are explained in the text.
“Caution”indicates a possible hazardous situation which, if not avoided, may result in slight or
moderate injury.
“Note!”indicates a situation which implies a risk of impaired welding result and damage to the
equipment.
“Important!” indicates practical tips and other useful special-message. It is no signal word for a
harmful or dangerous situation.
Utilization for intended purpose only
•The machine may only be used for jobs as defined by the “Intended purpose”.
•Utilization for any other purpose, or in any other manner, shall be deemed to be “not in accordance
with the intended purpose”. The manufacturer shall not be liable for any damage resulting from such
improper use.
Safety signs
•All the safety instructions and danger warnings on the machine must be kept in legible condition, not
removed, not be covered, pasted or painted cover.
Safety inspection
•The owner/operator is obliged to perform safety inspection at regular intervals.
•The manufacturer also recommends every 3-6 months for regular maintenance of power sources.
Electric shock can kill
•Touching live electrical parts can cause fatal shocks or severe burns. The electrode and work circuit
is electrically live whenever the output is on. The input power circuit and machine internal circuits are
also live when power is on. In MIG/MAG welding, the wire, drive rollers, wire feed housing and all
metal parts touching the welding wire are electrically live. Incorrectly installed or improperly grounded
equipment is a hazard.
•Do not touch live electrical parts of the welding circuit, electrodes and wires with your bare skin or wet
clothing.
•The operator must wear dry hole-free insulating welding gloves and body protection while performs
the welding.
•Insulate yourself from work and ground using dry insulating protection which is large enough to
prevent you full area of physical contact with the work or ground.
•Connect the primary input cable according to rules. Disconnect input power or stop machine before
installing or maintenance.
•If welding must be performed under electrically hazardous conditions as follow: in damp locations or
wearing wet clothing; on metal structures such as floors, gratings, or scaffolds; when in cramped
positions such as sitting, kneeling, or lying; or in occasion when there is a high risk of unavoidable or
accidental contact with the work piece or ground. Must use additional safety precautions:
semiautomatic DC constant voltage (wire) welder, DC manual (Stick) welder and AC welder with
reduced open-load voltage.
•Maintain the electrode holder, ground clamp, welding cable and welding machine in good, safe
operating condition. Replace damaged part immediately.
Electric and magnetic fields (EMF) may be dangerous
•If electromagnetic interference is found to be occurring, the operator is obliged to examine any
possible electromagnetic problems that may occur on equipment as follow:
-mains, signal and data-transmission leads
-IT and telecoms equipment
-measurement and calibration devices
-Wearers of pacemakers
•Measures for minimizing or preventing EMC problems:
-Mains supply
If electromagnetic interference still occurs, despite the fact that the mains connection in accordance
with the regulations, take additional measures
-Welding cables
Keep these as short as possible
Connect the work cable to the work piece as close as possible to the area being welded.
Lay term well away from other cables.
Do not place your body between your electrode and work cables.
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-Equipotential bonding
-Workpiece grounding (earthing)
-Shielding
Shield the entire welding equipment and other equipment nearby.
ARC rays can burn
•Visible and invisible rays can burn eyes and skin.
•Wear an approved welding helmet or suitable clothing made from durable flame-resistant material
(leather, heavy cotton, or wool) to protect your eyes and skin from arc rays and sparks when welding
or watching.
•Use protective screens or barriers to protect other nearby personnel with suitable, non-flammable
screening and/or warn them not to watch the arc nor expose themselves to the arc rays or to hot
spatter or material.
Fumes and gases can be dangerous
•Welding may produce fumes and gases, breathing these fumes and gases can be hazardous to your
health.
•When welding, keep your head out of the fume. If inside, ventilate the area at the arc to keep fumes
and gases away from the breathing zone. If ventilation is not good, wear an approved air-supplied
respirator.
•Work in a confined space only if it is well ventilated, or while wearing an air-supplied respirator.
•Welding fumes and gases can displace air and lower the oxygen level causing injury or death. Always
use enough ventilation, especially in confined areas, to insure breathing air is safe.
Welding and cutting sparks can cause fire or explosion
•When not welding, make sure the electrode circuit is not touching the work or ground. Accidental
contact can cause sparks, explosion, overheating, or fire. Make sure the area is safe before doing
any welding.
•Welding and cutting on closed containers, such as tanks, drums, or containers, can cause them to
blow up. Make sure proper steps have been taken.
•When pressure gas is used at the work site, special precautions are required to prevent hazardous
situations.
•Connect work cable to the work as close to the welding zone as practical to prevent welding current
from passing too long and creating fire hazards or overheat.
•Wear oil-free protective garments such as leather gloves, heavy shirt, cuffless trousers, high shoes,
and a cap. Wear ear plugs when welding out of position or in confined places. Always wear safety
glasses with side shields when in a welding area.
•Be attention that welding sparks and hot materials from welding can easily go through small cracks
and openings to adjacent areas and start a fire. Remove fire hazardous from the welding area, if not
possible, cover them thoroughly. Do not weld where flying sparks can strike flammable material and
where the atmosphere may contain flammable dust, gas, or liquid vapors (such as gasoline).
•Protect yourself and others from flying sparks and hot metal. Remove any combustibles from
operator before perform any welding.
•Keep a fire extinguisher readily available.
•Empty containers, tanks, drums, or pipes which have combustibles before perform welding.
•Remove stick electrode from electrode holder or cut off welding wire at contact tip when not in use.
•Apply correct fuses or circuit breakers. Do not oversize or bypass them.
Cylinder can explode if damaged
•Pressure gas cylinders contain gas under high pressure. If damaged, a cylinder can explode. Since
gas cylinders are normally part of the welding process, be sure to treat them carefully.
•Cylinders should be located away from areas where they may be struck or subjected to physical
damage. Use proper equipment, procedures, and sufficient number of persons to lift and move
cylinders.
•Always install cylinders in an upright position by securing to a stationary support or cylinder rack to
prevent falling over or tipping.
•Keep a safe distance from arc welding or cutting operations and any other source of heat, sparks, or
flame.
•No touching cylinder by welding electrode, electrode holder or any other electrically “hot” parts. Do
not drape welding cables or welding torches over a gas cylinder.
•Use only correct compressed gas cylinders, regulators, hoses, and fittings designed for the process
used; maintain them and associated parts in good condition.
•Use only compressed gas cylinders containing the correct shielding gas for the and properly
operating regulators designed for the gas and pressure used. All hoses, fittings, etc. should be
suitable for the application and maintained in good condition.
•Open the cylinder valve slowly and keep your head and face away from the cylinder valve outlet.
•Valve protection caps should be kept in place over valve expect when the cylinder is in use or
connected for use.
Hot parts can burn
•Do not touch hot parts with bare hand or skin.
•Ensure equipment is cooled down before perform any work.
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•If touching hot parts is needed, use proper tools and/or wear heavy, insulated welding gloves and
clothing to prevent burns.
Flying metal or dirt can injure eyes
•When welding, chipping, wire brushing, and grinding can cause sparks and flying metal. It can hurt
your eyes.
•Remember wear appropriate safety glasses with side shields when in welding zone, even under your
welding helmet.
Noise can damage hearing
•Noise from some processes or equipment can damage hearing.
•Remember wear approved ear protection to protect ears if noise level is high.
Moving parts can injure
•Stay away from moving parts such as fans.
•Stay away from pinch points such as drive rolls.
•Keep all doors, panels, covers, and guards closed and securely in place.
•Have only qualified persons remove doors, panels, covers, or guards for servicing and maintenance.
•Reinstall doors, panels, covers, or guards when servicing and maintenance is finished and before
reconnecting input power.
Overuse can cause overheating
•Use machine follow duty cycle. Reduce current or reduce duty cycle before starting to weld again.
•Allow cooling period.
•Do not block or filter airflow to unit.
Static can damage PCB
•Always wear wrist straps before touching PCB or parts.
•Use proper static-proof bags and package to store or move PCB.
Safety markings
•Equipment with CE-markings meets the basic requirements of the Low-Voltage and Electromagnetic
Compatibility Guideline (e.g. relevant product standards according to EN 60 974).
Safety markings
•The equipment with the CCC mark meets the basic requirements stipulated in the Chinese standards
GB / T15579.1-2013 and GB / T8118.
Safety markings
•This marking means that the product is certified for both the U.S. and Canadian markets, to the
applicable U.S. and Canadian standards. The preferred location of the indicators is as shown.
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Contents
1-GENERAL REMARKS.................................................................................................................................................. 6
1-1 Power source features.................................................................................................................................... 6
1-2 Functional principle......................................................................................................................................... 6
1-3 Output characteristics..................................................................................................................................... 7
1-4 Duty cycle..........................................................................................................................................................7
1-5 Applications...................................................................................................................................................... 8
1-6 Warning label....................................................................................................................................................8
2-VERSIONS BRIEFS...................................................................................................................................................... 9
3-BEFORE COMMISSIONING....................................................................................... 错误！未定义书签。
3-1 Utilization for intended purpose only............................................................ 错误！未定义书签。
3-2 Machine installation rules...............................................................................错误！未定义书签。
3-3 Power source connection...............................................................................错误！未定义书签。
3-4 Welding cables instruction............................................................................. 错误！未定义书签。
4-MIG350MC....................................................................................................................................................................12
4-1 System components..................................................................................................................................... 12
4-2 Basic equipments for welding......................................................................................................................12
4-3 Control panel.................................................................................................................................................. 13
4-4 Interface.......................................................................................................................................................... 15
4-5 Installation.......................................................................................................................................................17
4-6 welding process installation......................................................................................................................... 19
4-7 Technical data................................................................................................................................................20
4-8 Dimension.......................................................................................................................................................21
4-9 Disassembly and reassembly......................................................................................................................21
5-WIREFEEDER..............................................................................................................................................................23
6-TROUBLE SHOOTING...............................................................................................................................................24
7-CARE AND MAINTENANCE..................................................................................................................................... 25
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1-GENERAL REMARKS
1-1 Power source features
This series welding machines apply IGBT soft switch inverter technology; the power source enjoys highly stable welding
voltage against the fluctuation of power grid and arc length change. The internal control system achieves precise control
of welding process to ensure optimal welding results.
Features and benefits:
Enjoy reasonable static characteristic and sound dynamic characteristic
Less spatter due to the advanced waveform control technology
Continuous adjustment of welding current and voltage with wide range
2 step / 4step
Perfect functions of starting arc and reducing melting ball while stopping arc
Multiple security functions
Compact design, installed wire feeder, needle roller bearing design, stable wire feeding
Energy saving
Polarity conversion plug/socket design, easy for solid wire and FCAW welding switch
VRD function
1-2 Functional principle
This series of power sources adopt IGBT soft switch inverter technology to improve the dynamic response rate and make
the machines with small size and light weight. The control circuit's closed-loop control makes the power source enjoy
strong ability against power grid fluctuation and perfect welding performance. The schematic diagram is as shown in Fig.
1-2-1:
Fig. 1-2-1: Schematic diagram
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1-3 Output characteristics
Fig. 1-3-1: Output characteristics
1-4 Duty cycle
Duty cycle is percentage of 10 minutes that a machine can weld at rated load without overheating. If overheats,
thermostat(s) will open, output stops. Wait for fifteen minutes for the machine to cool down. Reduce amperage or duty
cycle before welding.
NOTE! Exceeding duty cycle can damage unit and void warranty.
Fig. 1-4-1: Duty cycle
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1-5 Applications
The MIG power source can be used with solid and flux-cored welding wire for welding carbon steel, alloy steel etc. The
power source is designed for the following recommend areas:
The power source is designed for the following recommend areas:
Automobile and components supply industry
Chemical plant construction
Boiler and pressure vessel
Shipyards
Power plant construction
Vehicle manufacturing
Machinery industry
Others
1-6 Warning label
The warning label is affixed onto the top of the power source, and it must not be removed or painted over.
Fig. 1-6-1: Warning label
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2-VERSIONS BRIEFS
Professional welding of special materials requires special welding parameters. Different models of the power sources are
matched to different weldings.
MIG 350MC
MIG350MC series is designed in accordance with the industrial standard. It has constant voltage (CV) and constant
current (CC) characteristics, also has 3 different welding processes: GMAW (MIG), SMAW (STICK) and Simple TIG.
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